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implementing accelerometer to move objects

/ Published in: Objective C
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motion of objects(labels and images)

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  1. #define SIGN(x)	((x < 0.0f) ? -1.0f : 1.0f)
  2.  
  3. float yaccel, yvelocity;
  4.  
  5. - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
  6.  
  7. 	float yy = acceleration.y;
  8. 	float accelDirY = SIGN(yvelocity) * -1.0f; 
  9. 	float newDirY = SIGN(yy);
  10.  
  11. 	if (accelDirY == newDirY)
  12. 		yaccel = (abs(yaccel) + 0.99f) * SIGN(yaccel);
  13.  
  14. 	yvelocity = -yaccel * yy;	
  15. }

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